Properly deal with static libraries to avoid broken cmake config

SDL2.spec

@@ -8,7 +8,7 @@
 Summary:	Simple DirectMedia Layer
 Name:		SDL2
 Version:	2.0.7
-Release:	3
+Release:	4
 License:	Zlib
 Group:		System/Libraries
 Url:		http://www.libsdl.org/
@@ -82,6 +82,7 @@ applications which will use %{name}.
 %{_libdir}/cmake/SDL2/
 %{_libdir}/pkgconfig/sdl2.pc
 %{_libdir}/*.so
+%{_libdir}/libSDL2main.a
 %dir %{_includedir}/SDL2
 %{_includedir}/SDL2/*.h
 %{_datadir}/aclocal/sdl2.m4
@@ -94,11 +95,11 @@ applications which will use %{name}.
 
 %build
 %global optflags %{optflags} -mstackrealign
-%cmake -DRPATH:BOOL=OFF
+%cmake \
+	-DRPATH:BOOL=OFF \
+	-DSDL_STATIC:BOOL=OFF
 %make
 
 %install
 %makeinstall_std -C build
 
-rm -f %{buildroot}%{_libdir}/*.a
-